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为了研究黑索今(RDX)基含铝温压炸药的爆炸能量释放规律及爆炸能量输出结构,对5种含铝温压炸药的爆热和爆速进行了测试,利用绝热式爆热量热计测量了铝粉质量分数为30%的RDX基含铝温压炸药在真空、0.1 MPa氮气、0.1 MPa空气和1.0 MPa氧气环境下的爆炸能量,结合测试数据对试样的爆轰热、爆热和燃烧热进行理论计算。结果表明,RDX基含铝温压炸药的爆速随铝粉含量的增加而线性减小;爆热随铝粉含量的增加呈现先增大后减小的趋势,在铝粉质量分数为40%时,爆热达到最大值。试样在真空、0.1 MPa氮气、0.1 MPa空气、1.0 MPa氧气环境下的爆炸能量逐渐增加,环境压力的增大和气氛环境中氧含量的增加都会提高炸药的爆炸能量,富氧环境下的爆炸能量可以定量地表征炸药的燃烧热。样品的爆轰热占燃烧热的9.8%~26.4%,爆热占燃烧热的34.5%~50.0%,且这两个参数都随铝粉含量的增加而降低。 相似文献
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采用自行设计的动态加载装置对HMX基、HMX/NTO基和HMX/FOX-7基3种温压炸药撞击响应规律进行了研究,获得炸药的临界点火速度,并通过密闭燃烧罐分析撞击后回收试样的燃烧特性。结果表明:3种温压炸药药柱在高速撞击下均经历了冲击、塑性变形、破碎飞散和点火反应阶段;HMX基、HMX/NTO基和HMX/FOX-7基温压炸药的临界点火速度分别为302.9、312.3 m/s和315.3 m/s,NTO和FOX-7能够提高温压炸药的临界点火速度;分析撞击后回收试样的燃烧特性发现,与HMX基温压炸药相比,HMX/NTO基和HMX/FOX-7基温压炸药升压时间分别增加了103.6%和103.3%,升压速率分别降低了17.3%和21.1%,且撞击后的燃烧速率显著降低。 相似文献
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通过测量铁镓合金在不同磁场下的阻抗频率特性,确定铁镓合金的柔顺系数S33和磁机械耦合系数K33,为铁镓合金在致动器和换能器等系统中的应用提供设计参考。分别测量棒状样品和片状样品在不同磁场下的阻抗频率特性,确定共振频率和反共振频率,计算S33和K33,并将片状样品与棒状样品特性参数进行对比分析。结果表明,片状和棒状样品的S33和K33随磁场的增加先增大后减小,在同一磁场下片状样品的柔顺系数小于棒状样品,片状样品的磁机械耦合系数大于棒状样品。随磁场的增加先增大后减小,在同一磁场下片状样品的柔顺系数小于棒状样品,片状样品的磁机械耦合系数大于棒状样品。 相似文献
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建立了Fe-Ga合金弓张结构发音振子换能器电场、磁场和固体力学场的多场耦合模型,研究了发音振子换能器磁场强度、磁感应强度和应变分布情况,并进行了换能器在不同频率下的磁场强度分析和模态分析。分析发现,随着频率的增高,Fe-Ga合金发音振子换能器的磁场强度逐渐减小,计算得到换能器的共振频率为984 Hz。测试了Fe-Ga合金换能器中的核心元件Fe-Ga合金的磁场强度与应变的关系,当磁场强度饱和值为40 k A·m-1时,应变为70×10-6。搭建了磁致伸缩材料磁特性测试系统,测试了Fe-Ga合金磁场频率为5、20、50 Hz的磁滞曲线,并测试了Fe-Ga合金的应变随频率的变化曲线,实验结果与换能器中Fe-Ga合金的应变仿真结果一致。 相似文献
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An orthorhombic phase of Mn2Sb (a=0.562 nm; b=0.432 nm; c=0.757 nm) was obtained for the first time in the manganese antimonide samples treated at a pressure of P=7 GPa and a temperature of T=1800 K. The high-pressure phase is metastable under normal conditions and breaks on heating above 420 K. A characteristic
feature of this phase is the absence of a total magnetic moment at T>90 K. 相似文献
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本文针对温压弹药爆炸波对人体创伤的评估问题,建立了肺器官受冲击波创伤的模型及计算数学模型,同时给出了评估方法.并通过建立人体胸部测试模型与人体肺创伤评估软件的关系,将人体测试模型和评估软件用于试验,得出了人体爆炸肺的创伤概率和分级创伤形式. 相似文献
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Ruihua Qiao Junming Gou Tianzi Yang Yiqun Zhang Feng Liu Shanshan Hu Tianyu Ma 《材料科学技术学报》2021,84(25):173-181
The irreversible motion of magnetic domain walls in ferromagnets can dissipate a large portion of the elastic energy,and the associated damping capacity is proportional to the magnetostriction constant.In contrast,here we found that the damping capacity of the large magnetostriction Fe-Ga alloys can be enhanced by 2-3 times through introducing structural defects including interfacial dislocations and stacking faults,despite that these defects deteriorate the magnetostriction.These structural defects were introduced by aging the BCC(body-centered-cubic)solution-treated precursor,for which the formation of mechanically harder FCT(face-centered-tetragonal)and/or FCC(face-centered-cubic)phases can result in high-density partial dislocations at the semi-coherent phase interfaces and quasi-periodically stacked nano-layer substructure inside the FCC variants.The structural defects act as extra damping sources besides the magnetic domain walls because the structural accommodation of the semi-coherent phase interfaces between BCC and FCT/FCC nanoprecipitates with different elastic moduli and the nano-layer substructure towards long-range ordered periodical stacking can dissipate a large portion of mechanical energy.These findings suggest that introducing structural defects provides fresh freedom to design high damping ferromagnetic materials. 相似文献
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A series of chemical compositions based on Cr, Fe and O with Zn as a partially substituting ion has been prepared in the general formula ZnxCr1-xFe2O by coprecipitation method using NH4OH as the precipitating agent at pH=10.3. The prepared samples were identified by both thermal analysis (DTA and TGA) and X-ray diffraction (XRD). It was found that no single phase was obtained for any of the studied compositions but a mixture of different phases was observed, depending on the molar percentage of zinc ion substitution as well as on the sintering temperature. The temperature dependence of the electrical conductivity, σ, of the prepared samples was plotted between 25 and 680℃. It was observed that the electrical conductivity increased with temperature for both samples with x=0.00 and 0.80 Zn ion content while it was nearly temperature independent for samples with intermediate Zn concentration x=0.2 and 0.5 mol fraction. The activation energy, Ea, calculated from the linear relation, lgσ-1000/T for the final mixtures (sintered at 1300℃) was calculated. 相似文献
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ZrO2-Y2O3(CaO)固体电解质的致密化烧结及电性能研究 总被引:9,自引:1,他引:8
研究了Y2O3、CaO稳定剂及Al2O3、SiO2(AS)添加剂对ZrO2固体电解质的烧结性能和电特性的影响。结果表明,加入AS的样品微观结构致密,其相对密度达到97%。AS添加剂导致ZrO2固体电解质的粒界偏析和电导率下降,但是在AS含量很少时,对ZrO2的电特性影响不大。 相似文献
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为研究高低温老化试验对含铝温压炸药性能的影响,对样品进行了质量变化和抗压强度的研究,并采用电测法测试含铝炸药在高低温试验前后的爆速。研究结果表明:样品的质量随高低温老化时间的增加而减少;老化试验前样品的爆速为6 685 m/s,老化14 d及28 d后爆速分别为6 590 m/s和6 799 m/s,爆速并未发生显著的变化;老化试验前样品的抗压强度为5.694 MPa,老化试验14 d及28 d后未经处理样品的抗压强度为9.110 MPa和9.615 MPa,处理后的样品抗压强度为6.523 MPa和6.717 MPa,处理后的样品抗压强度低于未处理样品,对样品进行处理能显著减缓抗压强度的增加。 相似文献
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